"I'm for Brandon because I've known him a long time, and I think he's a great candidate," said voter Adrianna Aleman.

The Democratic state legislature had changed the 6th District map this year, dropping conservative areas and adding Democratic voters here in western Montgomery county. Some feel the map was drawn so State Sen. Rob Garagiola, the state's Democratic majority leader, would win the seat in Congress. He's endorsed by Governor O'Malley and well-known by voters here in Germantown.

"Rob Garagiola... has experience, as opposed to an inexperienced businessman who's running against him," said voter Larry Block.

However, Garagiola is facing stiff competition from Potomac financier John Delaney, a Democrat who is endorsed by former President Bill Clinton and the Washington Post.

"I think [Delaney]'s a fresh, new person and I think that he would do a good job for us," said voter Denise Glover.

The other Democratic hopefuls in the primary are Charles Bailey, Ron Little and Milad Pooran.